linux-kernel - Re: [PATCH V2 11/16] block, bfq: reduce idling only in symmetric scenarios

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Date:   Fri, 31 Mar 2017 15:20:29 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "tj@...nel.org" <tj@...nel.org>,
        "paolo.valente@...aro.org" <paolo.valente@...aro.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "samuele.zecchini92@...il.com" <samuele.zecchini92@...il.com>,
        "fchecconi@...il.com" <fchecconi@...il.com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "avanzini.arianna@...il.com" <avanzini.arianna@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "riccardo.pizzetti@...il.com" <riccardo.pizzetti@...il.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>
Subject: Re: [PATCH V2 11/16] block, bfq: reduce idling only in symmetric
 scenarios

On Fri, 2017-03-31 at 14:47 +0200, Paolo Valente wrote:
> +       entity->weight_counter = kzalloc(sizeof(struct bfq_weight_counter),
> +                                        GFP_ATOMIC);
> +       entity->weight_counter->weight = entity->weight;

GFP_ATOMIC allocations are more likely to fail than GFP_KERNEL allocations.
What will happen if kzalloc() returns NULL?

Bart.